Moray Eels at Diergaarde Blijdorp, Rotterdam (Holland)

Moray Eel, or Muraenidae, are a family of eels whose members are found worldwide. There are approximately 200 species in 15 genera which are almost exclusively marine, but several species are regularly seen in brackish water, and a few are found in fresh water. Moray Eels are known for their slithering snake-like appearance, but they spend most of their time hiding in rocks and crevices. Morays are highly variable in colour pattern, and range from plain greyish to brownish forms, to species with spots, bands, ocelli and mottled, marbled or reticulated patterns.

Diergaarde Blijdorp, officially Rotterdam Zoo, is a zoo located in the northwestern part of Rotterdam. It is one of the oldest zoos in the Netherlands, and has been operated by the Stichting Koninklijke Rotterdamse Diergaarde ("Royal Rotterdam Zoo Foundation"). Divided into several zoogeographic regions, the 26-hectare (64.25-acre) Blijdorp Zoo is home to more than 180 species. It also has a shop, multiple cafes, and an information centre. The zoo is a member of the Dutch Zoo Federation (NVD) and the European Association of Zoos and Aquaria (EAZA). In 2007, it celebrated its 150th anniversary. The "Oceanium" is an aquarium that opened in the zoo in 2001.